Theory of Structures
The maximum deflection of a simply supported beam of span L, carrying an isolated load at the centre of the span; flexural rigidity being EI, is

WL3/48EL
WL3/3EL
WL3/8EL
WL3/24EL

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Theory of Structures
Slenderness ratio of a long column, is

Length of column divided by least radius of gyration
Area of cross-section divided by least radius of gyration
Radius of gyration divided by area of cross-section
Area of cross-section divided by radius of gyration

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